Gait retraining will consist of once a week sessions for six weeks. The gait training will use a fading feedback approach, where the percentage of each weekly session during which feedback is used is decreased from week to week until no feedback is used by the last training session. Throughout the six-week training period subjects will be encouraged to practice their gait for at least ten minutes per day. Subjects will continue to practice their gait throughout the remainder of the 52-week intervention. Subjects will have their walking activity recorded using a 3-axis pedometer, and smart shoes that will log their foot progression angle under free-living conditions. Compared to their baseline walking activity, participants will be instructed to increase their daily walking by ten minutes per day throughout the 52-week intervention.